Electric-arc lamp



2 Sheets- Sheet 1.

(No Model) G. W. BEARDSLEE.

ELEOTRIG ARC LAMP.

No. 270,725. Patented Jan. 16,1883.

N. PETERS. PhMwLMnvlm, Na-Mum. D. c.

(No Model.) 2 Sheets-Sheet2.

G. W. BEARDSLEE.

ELECTRIC ARC LAMP.

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PATENT OFFICE.

GEORGE BEARDSLEE, OF BROOKLYN, NEW YORK, ASSIGNOR TO WVILLIAM F. JOBBINS, OF EAST ORANGE, NEW JERSEY.

ELECTRIC-ARC LAMP.

SPECIFICATION forming part of Letters Patent No. 270,725, dated January 16, 1883.

' Application filed Mav20,1882. (Nomodet) To all whom it may concern:

Be it known that I, GEORGE WV. BEARDS- LEE, a citizen of the United States, and a resident of Brooklyn, New York, have invented an Improvement in Electric Lights, of which the following is a specification.

The object of my invention is to construct an improved automatic feed or regulator for the carbons of an electric-arc lamp, and this object I attain as more fully described hereinafter.

In the accompanying drawings, Figure l is a side view ofa lampembodying my invention; Fig. 2, an enlarged vertical section of the regulating'devices; Fig. 3, a plan view of the lamp, and Fig. 4 a sectional plan on the line A A is the portion of the frame of the lamp carrying theregulating devices, and through this frame passes vertically the upper-carbon holder B, while the lower-carbon-holder plate E is connected to the frame A by the rods D 'D, both these rods having an insulated connection with the frame A, and the rod D haw ing also preferably an insulated connection with the plate. E, while the rod D is electrically connected with the plate E.

To the under side of the upper horizontal portion of the frame A are secured the spools of the electro-magnets RF. In the lower end of the magnet F is fixed a core, f, of soft iron, which extends to the center of the spool, while in the upper half is a movable core, f, of similar metal, hung to a lever, G, which is pivoted to lugs g on the frame. The center of this lever is slotted to allow of the free passage of the carbon-holder B through it, as shown in Figs. 2 and 4:. To the opposite side of this balance-lever is pivoted the upper end of a non-magnetic rod, h, which passes through the hollow fixed core f also of soft iron, and ex-' tending to the center of the spool. To the lower end of this rod is secured the movable core f corresponding to the movable core f.

To the outer ends of the lever G are connected.

spiral springs s, having tension-adjusting devices s. The extent of movement of the lever G and of the movable cores is regulated by suitable screw-stops, T T. The clamping-lever K for the carbon-holder B rests at one end on the adjusting-screw L, and is held down by a spring, 1, and is connected by a link, It, at the other end to a projection on the corej. The core f is prevented from coming into contact with and sticking to the fixed coref by a suitable non-magnetic plug, 1), and the core f is prevented from coming into contact with the fixed coref by a shoulder on the rod 71 The spools F F are both wound with thick wire, so as to ofiier as little resistance as possible to the current, both coils being in the main circuit, as follows: The current, entering at 00, passes through the wire 1 to the coil F, coil F, wire 2 to the upper carbon, to the negatite carbon, lower-carbon-holder plate E, rod D, and out at y. The adjoining ends of the magnetic cores or poles ff, and also of the poles f f being about midway between the ends of 4,

the spools, when aeurrent is sent through the coils these half-cores will be charged with the adjoining ends north and south, so that the movable half-cores will not only be drawn to ward the centers by axial magnetism, but the half-cores of each spool will be powerfully attracted toward each other, the lever K will be raised and will grip the upper holder, so as to raise it and the carbon and form the are for the light. As the carbons are consumed and increased resistance offered to the current, the weight of the upper-carbon holder and lever K will overcome the attraction of the halfcores and the axial magnetism, and the lever K will release the holder B and allow it to drop the requisite distance, when the consequent immediate increase in the current will afiect the cores and cause the lever K to grip the holder B. By means of the tension-springs s the balance of the lever and the half-cores in relation to the current can be delicately adjusted, while the extent of movement of the half-cores can be regulated by the screws T.

One of the electromagnetic coils may in some cases be dispensed with; but I prefer to employ two magnets to operate the lever K. By the use of these half. cores or poles in the regulating-magnets I am enabled to obtain a comparatively powerful effect from a weak current, and thus thick wire may be used for the coil or coils which are in the main circuit and offer comparatively little resistance to the current.

I do not desire to claim the combination of the hollow fixed corewith amovable core having a non-magnetic rod passing through it, as this may form the subject of a separate application.

I claim as my invention- 1. The combination of the movable carbonholder of an electric lamp and a clamp therefor with an electro-Ina-gnetie coil having a fixed half-core and a movable half-core, the latter operating the clamp, substantially as described.

2. The combination of a movable cal-bonholder and clamp-lever with two electro-magnets in the main circuit, balance-lever O, pivoted between the two magnets and connected to the clamp-lever, said pivoted balance-lever carrying cores at opposite ends acted on by the electro-magnets.

3. The combination of a movable carbonholder and clamplever with electromagnets having movable half-cores, balance-lever pivoted at its center, and adjusting-springs connected to the ends of the balance-lever.

4. The combination of the pair of electromagnets in the main circuit having fixed and movable half-cores, and aelam p-lever connect ed to one movable half-core, with a balancelever pivoted at its center and having the movable half-cores pivoted toits opposite ends, one half-core being pivoted directly to the lever and the other through a non-magnetic rod passing through one of the fixed half-cores, all substantially as set forth.

5. The combination of the electro-magnets having movable cores, carbon holder, and clamp-lever with a balance-lever slotted at the center for the passage of the carbon-holder.

In testimony whereof I have signed my name to this specification in the presence of two subscribing Witnesses.

GEO. W. BEARDSLEE.

Witnesses:

WALTER It. FREEMAN, EUGENE F. BARNES. 

